This causes a segmentation fault in PHP 5.4.11

Segfault

<?php
class example
{
    private $instance;

    public function getInstance()
    {
        // Lazy load the instance
        if (null === $this->instance) {
            $this->instance = new example();
        }
        return $this->instance;
    }

    public function test()
    {
        // This creates a loop
        $this->getInstance()->test();
    }
}

$c = new Example();
$c->test();